JPS6046630A - Method for checking writing of broadcasting confirmation signal - Google Patents

Abstract

PURPOSE:To make rapid recovery by comparing a discrimination signal for checking the broadcasting of CM or the like with a check reference signal to confirm the normality of a digital discrimination signal superposed to a voice signal. CONSTITUTION:Whether a CM discrimination signal is correctly superposed or not is discriminated depending upon whether the time from a synchronous sound to the CM discrimination signal is included within a regulated time or not, whether the code of the CM discrimination signal is correct or not and whether the signal levels of frequency f1-f3 are included in a regulated level or not. Pulses passing through a band filter 54 and a rectifying/smoothing circuit 55 and corresponding to the frequency f1-f3 are digitized by an A/D converter 56, compared with a prescribed threshold by a level deciding circuit 57 to decide ''0'' or ''1'' and then compared with a signal previously accumulated in a register 62 and to be superposed and the compared result is displayed on a display part 64.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a method for checking whether a digital signal for confirming CM broadcasting is correctly superimposed on an audio signal.

(b) Conventional technology and problems What is the CM broadcast confirmation system? The purpose of the CM broadcast confirmation system is to automatically confirm whether or not commercial TV broadcasts by private TV stations have been carried out in accordance with the contract with Subonsa, and to output the confirmation results. It is a system.

In this system, in order to confirm the commercial broadcast, a commercial identification signal is inserted in advance into the audio band of the produced commercial, and the CML and separate signals are output from the TV broadcast commercial and sent to the central computer. Check with the contents of the broadcasting contract.

FIG. 1 is a conceptual diagram of the CI broadcast confirmation system, with each component shown as a block and the flow of data between them shown as a solid line. The process of broadcast confirmation will be explained based on this figure: (1) Confirmation requester 2 requests broadcast confirmation from broadcast confirmation company 10 using application form and schedule ■.

(2) On the other hand, the computer center 4 generates a CM identification signal and the corresponding CMllkl in advance, and sends them to the writing device 3 in the broadcast confirmation company 10 using a writing device input paper tape (■).

(3) The broadcast confirmation company 10 puts the dubbing mother tape (0M audio tape) brought in by the confirmation requester 2 into the writing device 3, specifies the CM No., and writes the corresponding CM identification signal on the broadcast confirmation tape. ■Produce and return it to requester 2 for confirmation along with the dubbing mother tape, and notify them of the commercial failure. Furthermore, the actually used CM No. and CM identification signal are sent to the computer center 4 using the writing device output paper tape (2).

In addition, here, the C between the writing device and the computer center is
Although paper tapes were used to send the MNo., CM identification signals, it is of course possible to use easily portable recording media such as floppy disks.

(4) The computer center 4 is an application form from the confirmation requester 2.

A file is created from the schedule and the CM numbers and CM identification signals actually used.

(5) On the other hand, confirmation requester 2 uses the broadcast confirmation audio tape ■ received from confirmation company 10 to produce a commercial film/VTRCM ■ through optical recording processing and phenomenon processing 6, and brings it to TV station 1 and requests it to be broadcast. do. As a result, the schedule ■ is finalized and sent to the computer center 4.

(6) The receiving device 5 is installed corresponding to each TV station,
During the broadcast time period, the CM broadcast radio wave (2) is received at that time, the C'M identification signal and the reception time are stored, and the CM identification signal (2) including the reception time is transmitted to the computer center 4 over the late night public line.

(7) The computer center 4 checks the CM identification signal ■ from the receiving device 5 with the CM identification signal in the file, and selects the corresponding CM.
A confirmation table [phase] is created using the NI and reception time and provided to the confirmation requester 2. In this way, the CM broadcast is confirmed.

In this case, if a writing error occurs in the writing device due to an operational error or device failure, or if the CM identification signal is corrupted due to an operational error or characteristic defect during optical recording or development, the CM will be broadcast and received. It is not discovered until reception is checked in the device.

The CMi5 separate signal color signal superimposed on the audio signal must be inaudible to the human ear, and its insertion band should be approximately 1.
This is limited to a low frequency region of 00 Hz or less, and it is not possible for humans to check the correctness of the superimposed signal by directly listening to it.

For this reason, in conventional writing devices, when the writing process is completed,
The audio tape was played back at a faster tape speed than when it was recorded, and the superimposed signal was heard as a pseudo-high frequency signal to confirm that it was superimposed.

However, with this method, it was not possible to check for code errors and superimposition level errors. One method is to input the audio tape playback signal directly into the receiving device for accurate checking, but the writing device and receiving device are not necessarily installed in the same place, and the There was a drawback that it could not be checked, and furthermore, it could not be checked when the receiving device was in the receiving state.

Furthermore, in order to process a huge number of CMs, the CM identification signal is converted into a fairly long code, but humans can visually read and check the CM identification signal detected by the receiving device and the correct CM identification signal. There was a possibility that a mistake would occur.

Also, in order to check for signal distortion after optical recording and development, you can either directly play back the audio recorded on the film's audio track in the project, or record the audio from the film's audio track onto an audio tape and receive it. There is no other way but to input it into the device (I had the same problem as mentioned above).

(C) Purpose of the Invention The present invention aims to solve the above-mentioned problems and to make it possible to easily confirm the normality of the writing function in the writing device.

(d) Structure of the Invention In order to achieve the above object, the present invention superimposes a digital signal on a predetermined frequency position of an audio signal of unit broadcast information and broadcasts it, demodulates the digital signal on the receiving side and In a broadcast confirmation information communication system for confirming the broadcast of broadcast information, a check reference signal holding means for holding a check reference signal, and a digital signal extraction for extracting the digital signal based on an audio signal read from a recording medium and played back. and comparison means for comparing the digital signal extracted by the digital signal extracting means and the check reference signal, and the tester is used to detect the digital signal superimposed on the audio signal. It is characterized by confirming normality.

(e) Embodiment of the Invention The configuration of an embodiment of the invention is shown in FIG. 2, taking as an example a tester used in connection with a writing device.

The writing device 21 superimposes a CM identification signal on the CM audio signal replayed from the reproduction tape deck 20, and the recording tape deck 22 creates a broadcast confirmation tape.

The recording tape deck 22 has a function of reproducing recorded contents immediately after recording, and notifies the tester 23 of CM identification signals to be (simultaneously reproduced).

The tester identifies the CM identification signal to be superimposed and the CM of the superimposition result.
It compares it with the identification signal and displays whether or not the writing process was performed correctly.

Below, the circuit configuration of the writing device (dual superimposition method) and the circuit configuration of the tester will be shown.

FIG. 3 shows an information signal superimposition circuit for multiplex broadcasting included in the write circuit 3 of FIG. 1. This is a circuit for superimposing a CM identification signal on a CM tape deck to confirm CM broadcast in multiplex broadcasting. In other words, the right (R), left/monaural (
The playback signals from the tape decks 311 and 302 for L/M) are transmitted to an amplifier (PA) 31. , 312
Amplified by high pass filter (HPF) 32+
, 322 for example below 100 Hz, and then a 100-amplifier (MA) 33. , 332 to tape decks 341, 342.

In the cutoff frequency range of these two channels,
Digital signals of multiple frequencies representing broadcast content are added to one of the channels. Here, tape deck 30
The reproduced signal of
F32! A synthesizer 44 is provided between the MA332 and the commercial power supply frequency 5011z, 6
0) Excluding the vicinity of 1z, the oscillation source 40. of the three selected waves f, , C2, fU. ．． 402,40. The outputs of each switch (SWI) 41. , (SW2)412. (SW
3) Controlled and encoded by digital information through 413, band-pass filter corresponding to each frequency (
BPFI)42. , (BPF2) 422, (BPF3)
423, and consists of a discrimination signal and an identification signal.
Create M identification signal.

Figure 4 (al~(C1 is an explanatory diagram of the operation in the writing device. Figure 4 (a+) shows an example of the frequency characteristics of (HPF) 321, 322, the cutoff frequency is 100 Hz, the frequency f,... f, , f, are 40Hz and 45, respectively.
11z, set around 55 Hz.

(b) ■ to ■ in the same figure show an example of a CM identification signal.
In the same figure (b) ■ is one of the CM audio outputs preceded by the synchronization signal.
As an example, CM identification signals of low frequencies f+, fz, and C3 shown in FIG. That is, as shown in the figure, f,,C2, which indicates the broadcast content.
, C9 is provided at the beginning of each of the identification information, and this discrimination signal is first detected for the audio signal, and it is discriminated whether or not the audio signal is a superimposed CM identification signal, and the discrimination signal is detected. This is to detect the identification information of the broadcast content that is depolarized only when

(C) of the same figure shows (BPFI) 42. , (BPF2
)42□, (BPF3)423 shows an example of the frequency characteristics.

FIG. 5 shows the circuit configuration of the tester shown in FIG. 2, which is the main part of the present invention.

In the same figure, the reproduction audio signal from the recording tape deck has its reception level adjusted by an attenuator (ATT) 51, and then passed through a low-pass filter (LPF) 52 and an amplifier 1 (PAL) 53, for example, at the above-mentioned frequency f1° f2. , flo corresponding to the bandpass filter (BPFl) 541. (BPF2)
5'42. (BPF3) 543, and a pulse waveform is formed by rectifying and smoothing circuits 551 to 553, respectively.

This pulse waveform is converted into a digital signal by the sampling pulse from the signal sampling timer 61 in the A/D circuit.

Here, the sampling pulse is generated at a fixed time from the synchronized sound recorded with the cM7 separate signal added to the reproduction signal of the recording tape deck mentioned above.

Detection of the synchronous sound is performed using the amplifier 2 (PA2) 5B and the rectifying and smoothing circuit 59.

The MPU section 60 is a microprocessor that controls the sampling timer 61 and other sections.

The A/D output is level judgment circuit 57. ~57. It is compared with a predetermined threshold value and judged as "1" or "0". This judgment result is sent in advance from the writing device or manually set from the code setting switch 65, and is stored in the register 62. It is compared with the stored "signal that should have been superimposed" in the comparator circuit 63, and the comparison result is displayed on the display section 64.Here, the case where it is connected to a writing device has been explained as an example. By installing a similar tester in an optical recording laboratory or a developing laboratory, CMRfi separation can be easily performed by using the audio output of a film projector as input, or the audio output after converting film to audio tape. It is possible to check that the signal is superimposed with a positive signal.However, in this case, it is necessary to manually set the reference signal for comparison using a code setting switch.

The determination of whether the CM identification signal is correctly superimposed depends on whether the following items are satisfied.

In other words, the time from the fal M period sound to the CM identification signal is the specified time.

(b) If the code of the CM identification signal is correct - Sampling is performed at a constant period (t2).

- At this time, t2 is a value that is an integer fraction of the one-digit length of the discrimination signal and CM identification signal.

The threshold value for determining the level is the level that should have been written (LS) and the two points above and below it (Ls, LL
).

Here, LH and LL are determined from the margin of the broadcast confirmation system.

Based on the level determination result, the code is determined from the number of "1" or "0" for each digit.

Here, check the above item (a) by using tl.

It is possible to check item (b) by checking the code match, and item (c) can be checked by using a plurality of thresholds.

(F) Effects of the Invention The present invention provides a testing method that is much smaller but has the same functionality as the conventional testing method using a receiving device. The normality of the superimposed signal can be checked immediately after the writing process and the subsequent optical recording, development, etc. processing, and writing errors, processing errors, etc. can be quickly discovered and corrected immediately.

Power\ Furthermore, as a result of the test, “GOOD” was “No”.

By displaying ``GOOD'' or ``GOOD,'' a highly reliable test without human intervention for comparative judgment is possible.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a CM broadcast confirmation system, FIG. 2 is an explanatory diagram of operation, FIG. 5 is a diagram showing a circuit configuration of a tester according to an embodiment, and FIG. 6 is a diagram showing an example of a checking method. In FIG. 2, 21 is a writing device, 22 is a recording tape deck, and 23 is a tester.

Claims (3)

[Claims] (1) In a broadcast confirmation information communication system that superimposes a digital signal on a predetermined frequency position of an audio signal of unit broadcast information and broadcasts the same, and demodulates the digital signal on the receiving side to confirm the broadcast of the corresponding unit broadcast information, Check reference signal holding means for holding the check reference signal;
The tester is equipped with a digital signal extraction means for extracting a signal, and a comparison means for comparing the digital signal extracted by the digital signal extraction means with the check reference signal, and the tester is used to detect an audio signal. A broadcast confirmation signal writing check method characterized by confirming the normality of a digital signal superimposed on a broadcast confirmation signal. (2) The check reference signal is sent to the tester from a writing device that superimposes the digital signal on the audio signal. Check method. (3) The broadcast confirmation signal writing check method according to claim (1), wherein the check reference signal is input to the check reference signal holding means by a setting switch means.